Optimal moisture, fineness, and density of compacted coal briquettes

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The relationship among the optimal moisture, fineness, and density of compacted coal briquettes is interrelated; together, they influence the strength and stability of the briquettes. Moisture, fineness, and density are key factors affecting the strength of compacted coal briquettes; by properly controlling these parameters, the quality and stability of the coal briquettes can be improved. 1. Effect of moisture on the strength of compacted coal briquettes: Moisture is one of the key factors affecting the strength of compacted coal briquettes. An appropriate moisture content allows the binder between coal particles to function, thereby increasing the strength of the coal briquette. Generally, the moisture content of the compacted coal briquettes should be maintained between 9% and 11%, so as to ensure proper bonding during the compacting process and avoid a decrease in strength due to excessive moisture. 2. Influence of fineness on the strength of compacted coal briquettes: Fineness refers to the size distribution of coal particles, and it also has a significant impact on the strength of coal briquettes. Coal with a fineness of less than 3 mm should account for 90%-93%, of which the portion with a particle size of less than 0.5 mm should be between 40%-50%. The higher the fineness, the greater the bulk density and compressive strength of the coal cake, but its shear strength decreases ； Conversely, the lower the fineness, the more ramming effort is required to achieve a certain level of stability. 4. Effect of density on the strength of compacted coal briquettes. Density refers to the mass of coal per unit volume; it can be increased by raising the moisture and fineness levels, as well as by increasing the number of compaction passes and the compression height. Generally, the density of the compacted coal briquettes should be above 1.05, to ensure that they do not collapse at high temperatures.